What Windows OS are you trying to run the installer on? And are you using any antivirus/antimalware software? If so, what?
Thanks, I use Windows 10 Enterprise x64 1903, but I remember on previous builds of Windows 10 this error was also present, this bug exists for a very long time, I have no idea why no one reported, and due to lack of any contact form on the website I couldn't report anyway, finally had to register in forum for a simple report.
I also run x64 version of JRiver installer, please note than when starting setup:
Accept > Custom > Normal Install > now installation path comes, right click inside the TextBox and setup will crash/close immediately!
or you can take portable path:
Accept > Custom > Portable Install > now installation path comes, right click inside the TextBox and setup will crash/close immediately!
I have no any Anti Virus or Firewall rather than Windows internal one, which is DISABLED as well, and being enabled or disabled does not have any effect on this bug!
* I say check the code under TextBox_Right_Click_Event, there you are calling an invalid function or method.
* Suppressing errors in programming is the worst possible thing, such errors can occur without any message!